White Fused Alumina (WFA or WA) is an important raw material for advanced refractories and abrasives, a widely used raw material in refractories, ceramics shapes, grinding wheels, sandpaper, blasting media, metal preparation, laminates, coatings, lapping, polishing, grinding, and hundreds of other applications. As it is a very pure, low iron alumina, specific refractory applications include high tech refractory castables, isostatic pressed refractories, and pre-cast refractory shapes. The benefits of White Fused Alumina in these applications are high alumina content, low impurities, and stability at high temperatures.
White fused alumina is manufactured by the fusion of controlled quality pure grade Bayer Alumina in an electric arc furnace at temperatures greater than 2000 degree Celsius followed by a slow solidification process. The cooled crude is further crushed. The crushed crude is the semi-product. Then, the semi-product receives high intensity magnetic treatment to remove virtually all of the magnetic iron present. Air washing is also applied to the semi-product, to ensure the cleaness of the white fused alumia. Finally, the semi-product is sieved and classified into different grain sizes.